Q.1

The temperature at which the second Virial co-efficient of a real gas is zero is called the

  • eutectic point
  • Boyle temperature
  • boiling point
  • critical temperature
Q.2

The hydroxyl ion (OH-) concentration in a solution having pH value 3 will be

  • 10-11
  • 10-10
  • 10-3
  • 10-4
Q.3

Pick out the wrong conversion formula for the conversion of weight units :

  • 1 tonne = 1000 kg = 22.046 lbs
  • 1 U.S. ton = 907 kg = 0.907 tonne = 0.893 ton
  • 1 ton = 2240 lbs = 1016 kg = 1.016 tonnes = 1.12 U.S. tons
  • none of these
Q.4

Isotopes are atoms having the same

  • mass number
  • number of neutrons
  • atomic mass
  • none of these
Q.5

c.c. each of hydrogen atmm Hg pressure and oxygen atmm Hg pressure are put together in a vessel of 1 litre capacity. The final pressure of the gas mixture will be __________ mm Hg.

  • 650
  • 700
  • 600
  • 375
Q.6

Pick out the wrong unit conversion.

  • 1 atm. = 760 mm Hg = 29.92 inch Hg = 14.7 psi = 1.013 bar = 1.013 kgf/cm2
  • 1 kPa = 100 bar
  • 1 mm Hg = 1 torr = 133.3 Pa
  • -
Q.7

A gas at 0°C was subjected to constant pressure cooling until its volume became half the original volume. The temperature of the gas at this stage will be

  • 0°C
  • 0°K
  • -136.5°C
  • -136.5°K
Q.8

Which of the following has the least (almost negligible) effect on the solubility of a solute in a solvent ?

  • Temperature
  • Nature of solute
  • Pressure
  • Nature of solvent
Q.9

If the partial pressure of the solvent in the vapor phase is equal to the vapor pressure of the solvent at that temperature, then the system is said to be at its

  • bubble point.
  • saturation temperature.
  • dew point.
  • both (b) and (c).
Q.10

Mass number of an atom is the sum of the numbers of

  • neutrons and protons
  • protons and electrons
  • neutrons and electrons
  • both(a)&(b)
Q.11

Roult's law is obeyed by a __________ solution.

  • saturated
  • molar
  • normal
  • none of these
Q.12

Kinematic viscosity of 1 m2 /second is equivalent to __________ stokes.

  • 10
  • 102
  • 103
  • 104
Q.13

Internal energy of a substance comprises of the __________ energy.

  • vibrational
  • rotational
  • translational
  • all (a), (b) & (c)
Q.14

Atomic __________ of an element is a whole number.

  • weight
  • number
  • volume
  • radius
Q.15

In osmosis through a semi-permeable membrane, diffusion of the

  • solvent is from low concentration to high concentration region.
  • solvent is from high concentration to low concentration region.
  • solute takes place.
  • none of these.
Q.16

The number of atoms of oxygen present in 11.2 litres of ozone (O3) at N.T.P. are

  • 3.01 x 1022
  • 6.02 x 1023
  • 9.03 x 1024
  • 1.20 x 1024
Q.17

An oxidation process is accompanied by decrease in the

  • number of electrons.
  • oxidation number.
  • number of ions.
  • all (a), (b) & (c).
Q.18

Boiling point of a solution as compared to that of the corresponding solvent is

  • less
  • more
  • same
  • either more or less; depends upon the solvent
Q.19

Real gases approach ideal behaviour at

  • high pressure & high temperature.
  • low pressure & high temperature.
  • high pressure & low temperature.
  • low pressure & low temperature.
Q.20

Pick out the wrong unit conversion.

  • 1 Joule = 4.186 calorie.
  • 1 kcal = 3.968 BTU = 0.00116 kWh = 0.00156 hp.
  • 1 ton of TNT (tri-nitro-toluene) = 4.2 GJ (1G = 109).
  • 1 ft.lbf= 0.3238 calorie = 0.1383 kg.m = 1.356 J = 1.356 N.m.
Q.21

Disappearance of snow in subzero weather exemplifies the process of

  • evaporation
  • sublimation
  • vaporisation
  • melting
Q.22

The average value of heat of neutralisation of dilute solution of strong acids and strong bases is about __________ kcal/kg.mole of water formed.

  • 6680
  • 13360
  • 2481
  • 97302
Q.23

The elevation in boiling point of a solution is proportional to the __________ of the solution.

  • molal concentration
  • reciprocal of the molal concentration
  • normality
  • molarity
Q.24

Pick out the wrong statement.

  • One kg-mole of an ideal gas occupies 22.4 m3 at N.T.P.
  • One lb-mole of an ideal gas occupies 359 ft3 at N.T.P.
  • One gm-mole of an ideal gas occupies 22.4 litres (i.e., 22400 c.c) at N.T.P.
  • Density of dry air at N.T.P. is 1 gm/litre.
Q.25

Vapor pressure of a solution is proportional to(where, Sv and St are mole fraction of solvent and solute respectively).

  • Sv
  • 1/St
  • St
  • 1/Sv
Q.26

A 'limiting reactant' is the one, which decides the __________ in the chemical reacation.

  • equilibrium constant
  • conversion
  • rate constant
  • none of these
Q.27

The heat evolved in the combustion of benzene is represented by the equation:
    C6H6 + 7.5 O2 = 6CO2 + 3H2O, ΔH = 3264.6 kJ/kg. mole
The heat energy change, whengm of C6H6 is burnt in an open container, will be __________ kJ/kgmole.

  • +816.15
  • +1632.3
  • -1632.3
  • -2448.45
Q.28

What is the simplest formula of a compound containingof element A (atomic weight =andof element B (atomic weight =?

  • AB3
  • A2B3
  • A2B
  • AB2
Q.29

The value of (Cp - Cv)for a real gas obeying Vander Wall's equation is

  • R
  • > R
  • < R
  • 0.5 R
Q.30

A fluid gas produced on burning furnace oil contains 0.gm mole of CO2, 0.gm mole of oxygen and 0.gm mole of N2. What is its molecular weight ?

  • 28.6
  • 30.0
  • 30.6
  • 32.6
Q.31

A car tyre of volume 0.m3 is inflated tokPa atK. After the car is driven forhours, the pressure in the tyre increases tokPa. Assume air is an ideal gas and Cv for air isJ/mole.K. The change in the internal energy of air in the tyre in J/mole is

  • 380
  • 630
  • 760
  • 880
Q.32

At higher temperatures, molal heat capacities for most of the gases (at constant pressure) __________ with increase in temperature.

  • varies linearly
  • increases
  • decreases
  • does not vary
Q.33

Pick out the wrong unit conversion.

  • l kgf= 9.8 Newton.
  • 1 stoke = 1 m2/second.
  • 1 Pascal second = 10 poise.
  • 1 ppm = 1 ml/m3 = 1 mg/kg.
Q.34

Under conditions of equal reduced pressure and equal reduced temperature, substances are said to be in the 'corresponding states'. At equal reduced conditions i.e., at the corresponding state, the __________ of different gases are nearly the same.

  • compressibility
  • molecular weight
  • humidity
  • none of these
Q.35

The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. If, at a total pressure of one standard atm. exerted by the vapours of water and toluene, the mole fraction of water Xw in the vapour phase satisfies

  • 0 < Xw < 0.5
  • Xw = 0.5
  • 0.5 < Xw < 1.0
  • Xw = 1.0
Q.36

Simultaneous doubling of the absolute temperature of a gas and reduction of its pressure to half, will result in __________ in the volume of the gas.

  • no change
  • doubling
  • l/4th reduction
  • four fold increase
Q.37

Refluxing of part of the distillate in a fractionating column is a 'recycling operation', aimed primarily at

  • heat conservation.
  • yield enhancement.
  • product enrichment.
  • none of these.
Q.38

Which of the following expressions defines the Baume gravity scale for liquids heavier than water ?

  • (141.5/G) - 131.5
  • 145 - (145/G)
  • 200(G-1)
  • (400/G) - 400
Q.39

The accumulation in a steady state combustion process, burning 1 kg mole of carbon with 1 kg mole of oxygen thereby producing 1 kg mole of carbon dioxide, is __________ kg mole.

  • 1
  • 0
  • 16
  • 44
Q.40

Addition of a non-volatile solute to a pure solvent

  • increases its freezing point.
  • increases its boiling point.
  • decreases its freezing point.
  • both (b) and (c)
Q.41

A gas mixture contains 6 moles of H2 and 2 moles of N2. If the total pressure of the gaseous mixture is 4 kgf/cm2 ; then the partial pressure of N2 in the mixture will be __________ kgf/cm2 .

  • 1
  • 2
  • 4
  • 8
Q.42

How much O2 can be obtained fromkg of water ?

  • 32 kg
  • 80 kg
  • 64 kg
  • 90 kg
Q.43

In a mixture of benzene vapor and nitrogen gas at a total pressure ofmm Hg, if the absolute humidity of benzene is 0.2 kg benzene/kg nitrogen, the partial pressure of benzene in mm Hg is

  • 180
  • 60.3
  • 720
  • 200
Q.44

For an ideal gas, the compressibility factor

  • decreases with pressure rise.
  • is unity at all temperature.
  • is unity at Boyle's temperature.
  • zero.
Q.45

1 Pascal (unit of pressure) is equal to __________ N/m2.

  • 10
  • 1
  • 0.1
  • 1000
Q.46

In case of a solution (not of a solid in a liquid), whose total volume is less than the sum of the volumes of its components in their pure states, solubility is

  • independent of temperature.
  • increases with rise in pressure.
  • increased with decrease in pressure.
  • unchanged with pressure changes.
Q.47

Pure oxygen is mixed with air to produce an enriched air containingvolume % of oxygen. The ratio of moles of air to oxygen used is

  • 1.72
  • 0.58
  • 0.5
  • 0.2
Q.48

In which of the following case of mixing of a strong acid with strong base (each ofconcentration), temperature increase will be the highest ?

  • 30 c.c acid and 30 c.c base.
  • 20 c.c acid and 25 c.c base.
  • 15 c.c acid and 35 c.c base.
  • 35 c.c acid and 15 c.c base.
Q.49

If the absolute temperature of an ideal gas is tripled and simultaneously the pressure is reduced to one third; then the volume of gas will

  • remain unaltered
  • increase nine fold
  • increase three fold
  • decrease three fold
Q.50

A saturated vapor on being compressed would

  • condense
  • form wet steam
  • both (a) & (b)
  • neither (a) nor (b)
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